蛇形添数

#include <stdio.h>
#include <string.h>
int main(void)
{
	int arr[100][100];
	memset(arr,0,sizeof(arr));
	//都初始为0
	int n,x=0,y=0,i,j,tot=0;
	scanf("%d",&n);
	y=n-1;
	arr[0][n-1]=1;
	tot=1;
	while (tot<n*n)
	{
		while(x<n-1&&!arr[x+1][y]){arr[++x][y]=++tot;}
		//前一位有非0时转向
		while(y-1>=0&&!arr[x][y-1]){arr[x][--y]=++tot;};
		//边界值
		while(x-1>=0&&!arr[x-1][y]){arr[--x][y]=++tot;}
		while(y+1<n&&!arr[x][y+1]){arr[x][++y]=++tot;}
		
	}
	for (i = 0; i < n; i++)
	{
		for (j = 0; j < n; j++)
		{
			printf("%d ",arr[i][j]);
		}
		printf("\n");
	}
	
    return 0;
}